public class Solution
extends Object
930 - Binary Subarrays With Sum\.
Medium
Given a binary array `nums` and an integer `goal`, return _the number of non-empty **subarrays** with a sum_ `goal`.
A **subarray** is a contiguous part of the array.
**Example 1:**
**Input:** nums = [1,0,1,0,1], goal = 2
**Output:** 4
**Explanation:** The 4 subarrays are bolded and underlined below:
[**1,0,1** ,0,1]
[**1,0,1,0** ,1]
[1, **0,1,0,1** ]
[1,0, **1,0,1** ]
**Example 2:**
**Input:** nums = [0,0,0,0,0], goal = 0
**Output:** 15
**Constraints:**
* 1 <= nums.length <= 3 * 104
* `nums[i]` is either `0` or `1`.
* `0 <= goal <= nums.length`